boxdatareader.cpp Example File | Qt Charts 5.12.11

- Qt 5.12
- Qt Charts
- Box and Whiskers Example
- boxdatareader.cpp Example File
- Qt Charts | Commercial or GPLv3

# boxdatareader.cpp Example File

boxplotchart/boxdatareader.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2016 The Qt Company Ltd.
     ** Contact: https://www.qt.io/licensing/
     **
     ** This file is part of the Qt Charts module of the Qt Toolkit.
     **
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     #include "boxdatareader.h"

     BoxDataReader::BoxDataReader(QIODevice *device) :
         QTextStream(device)
     {
     }

     void BoxDataReader::readFile(QIODevice *device)
     {
         QTextStream::setDevice(device);
     }

     QBoxSet *BoxDataReader::readBox()
     {
         QString line = readLine();
         if (line.startsWith("#"))
             return 0;

         QStringList strList = line.split(" ", QString::SkipEmptyParts);

         sortedList.clear();
         for (int i = 1; i < strList.count(); i++)
             sortedList.append(strList.at(i).toDouble());

         qSort(sortedList.begin(), sortedList.end());

         int count = sortedList.count();

         QBoxSet *box = new QBoxSet(strList.first());
         box->setValue(QBoxSet::LowerExtreme, sortedList.first());
         box->setValue(QBoxSet::UpperExtreme, sortedList.last());
         box->setValue(QBoxSet::Median, findMedian(0, count));
         box->setValue(QBoxSet::LowerQuartile, findMedian(0, count / 2));
         box->setValue(QBoxSet::UpperQuartile, findMedian(count / 2 + (count % 2), count));

         return box;
     }

     qreal BoxDataReader::findMedian(int begin, int end)
     {
         int count = end - begin;
         if (count % 2) {
             return sortedList.at(count / 2 + begin);
         } else {
             qreal right = sortedList.at(count / 2 + begin);
             qreal left = sortedList.at(count / 2 - 1 + begin);
             return (right + left) / 2.0;
         }
     }